Preimplantation genetic testing for aneuploidy versus morphology as selection criteria for single frozen-thawed embryo transfer in good-prognosis patients: a multicenter randomized clinical trial

Fertil Steril. 2019 Dec;112(6):1071-1079.e7. doi: 10.1016/j.fertnstert.2019.07.1346. Epub 2019 Sep 21.


Objective: To evaluate the benefit of next-generation sequencing (NGS)-based preimplantation genetic testing for aneuploidy (PGT-A) for embryo selection in frozen-thawed embryo transfer.

Design: Randomized controlled trial.

Setting: Not applicable.

Patient(s): Women aged 25-40 years undergoing IVF with at least two blastocysts that could be biopsied.

Intervention(s): Randomization for single frozen-thawed embryo transfer with embryo selection based on PGT-A euploid status versus morphology.

Main outcome measure(s): Ongoing pregnancy rate (OPR) at 20 weeks' gestation per embryo transfer.

Result(s): A total of 661 women (average age 33.7 ± 3.6 years) were randomized to PGT-A (n = 330) or morphology alone (n = 331). The OPR was equivalent between the two arms, with no significant difference per embryo transfer (50% [137/274] vs. 46% [143/313]) or per intention to treat (ITT) at randomization (41.8% [138/330] vs. 43.5% [144/331]). Post hoc analysis of women aged 35-40 years showed a significant increase in OPR per embryo transfer (51% [62/122] vs. 37% [54/145]) but not per ITT.

Conclusion(s): PGT-A did not improve overall pregnancy outcomes in all women, as analyzed per embryo transfer or per ITT. There was a significant increase in OPR per embryo transfer with the use of PGT-A in the subgroup of women aged 35-40 years who had two or more embryos that could be biopsied, but this was not significant when analyzed by ITT.

Clinical trial registration number: NCT02268786.

Keywords: IVF; frozen-thawed embryo transfer; next-generation sequencing; preimplantation genetic testing; single-embryo transfer.

Publication types

  • Comparative Study
  • Multicenter Study
  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aneuploidy*
  • Australia
  • Biopsy
  • Blastocyst / pathology*
  • Cryopreservation*
  • Embryo Implantation
  • Female
  • Fertility
  • Fertilization in Vitro* / adverse effects
  • Genetic Testing*
  • High-Throughput Nucleotide Sequencing*
  • Humans
  • Infertility / diagnosis
  • Infertility / physiopathology
  • Infertility / therapy*
  • North America
  • Predictive Value of Tests
  • Pregnancy
  • Pregnancy Rate
  • Preimplantation Diagnosis / methods*
  • Risk Factors
  • Single Embryo Transfer* / adverse effects
  • Treatment Outcome
  • United Kingdom

Associated data